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"\n# Print Graph\n\nExample subclass of the Graph class.\n"
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"import matplotlib.pyplot as plt\nimport networkx as nx\nfrom networkx import Graph\n\n\nclass PrintGraph(Graph):\n \"\"\"\n Example subclass of the Graph class.\n\n Prints activity log to file or standard output.\n \"\"\"\n\n def __init__(self, data=None, name=\"\", file=None, **attr):\n super().__init__(data=data, name=name, **attr)\n if file is None:\n import sys\n\n self.fh = sys.stdout\n else:\n self.fh = open(file, \"w\")\n\n def add_node(self, n, attr_dict=None, **attr):\n super().add_node(n, attr_dict=attr_dict, **attr)\n self.fh.write(f\"Add node: {n}\\n\")\n\n def add_nodes_from(self, nodes, **attr):\n for n in nodes:\n self.add_node(n, **attr)\n\n def remove_node(self, n):\n super().remove_node(n)\n self.fh.write(f\"Remove node: {n}\\n\")\n\n def remove_nodes_from(self, nodes):\n for n in nodes:\n self.remove_node(n)\n\n def add_edge(self, u, v, attr_dict=None, **attr):\n super().add_edge(u, v, attr_dict=attr_dict, **attr)\n self.fh.write(f\"Add edge: {u}-{v}\\n\")\n\n def add_edges_from(self, ebunch, attr_dict=None, **attr):\n for e in ebunch:\n u, v = e[0:2]\n self.add_edge(u, v, attr_dict=attr_dict, **attr)\n\n def remove_edge(self, u, v):\n super().remove_edge(u, v)\n self.fh.write(f\"Remove edge: {u}-{v}\\n\")\n\n def remove_edges_from(self, ebunch):\n for e in ebunch:\n u, v = e[0:2]\n self.remove_edge(u, v)\n\n def clear(self):\n super().clear()\n self.fh.write(\"Clear graph\\n\")\n\n\nG = PrintGraph()\nG.add_node(\"foo\")\nG.add_nodes_from(\"bar\", weight=8)\nG.remove_node(\"b\")\nG.remove_nodes_from(\"ar\")\nprint(\"Nodes in G: \", G.nodes(data=True))\nG.add_edge(0, 1, weight=10)\nprint(\"Edges in G: \", G.edges(data=True))\nG.remove_edge(0, 1)\nG.add_edges_from(zip(range(3), range(1, 4)), weight=10)\nprint(\"Edges in G: \", G.edges(data=True))\nG.remove_edges_from(zip(range(3), range(1, 4)))\nprint(\"Edges in G: \", G.edges(data=True))\n\nG = PrintGraph()\nnx.add_path(G, range(10))\nnx.add_star(G, range(9, 13))\npos = nx.spring_layout(G, seed=225) # Seed for reproducible layout\nnx.draw(G, pos)\nplt.show()"
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